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Iwamoto M, Yamaguchi T, Sekiguchi Y, Oishi S, Shiiki T, Soma M, Nakamura K, Yoshida M, Chaya H, Mori Y, Miyauchi R, Hasegawa J, Nagayama T, Honda T. Pharmacokinetic and Pharmacodynamic Profiles of Glyco-Modified Atrial Natriuretic Peptide Derivatives Synthesized Using Chemo-enzymatic Synthesis Approaches. Bioconjug Chem 2018; 29:2829-2837. [PMID: 30107743 DOI: 10.1021/acs.bioconjchem.8b00427] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Atrial natriuretic peptide (ANP) exerts beneficial pharmacological effects in the treatment of various cardiovascular disorders, such as acute congestive heart failure (ADHF). However, the clinical use of ANP is limited to the continuous intravenous infusion owing to its short half-life (2.4 ± 0.7 min). In the present study, we conjugated the glyco-modified ANP with a monoclonal antibody (mAb) or an Fc via chemo-enzymatic glyco-engineering using EndoS D233Q/Q303L. The most potent derivative SG-ANP-Fc conjugate extended the half-life to 14.9 d and the duration of blood pressure lowering effect to over 28 d. This new biologic modality provides an opportunity to develop outpatient therapy after ADHF.
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Affiliation(s)
- Mitsuhiro Iwamoto
- Daiichi Sankyo Co., Ltd., 1-2-58, Hiromachi , Sinagawa-ku, Tokyo 140-8710 , Japan
| | - Takahiro Yamaguchi
- Daiichi Sankyo Co., Ltd., 1-2-58, Hiromachi , Sinagawa-ku, Tokyo 140-8710 , Japan
| | - Yukiko Sekiguchi
- Daiichi Sankyo Co., Ltd., 1-2-58, Hiromachi , Sinagawa-ku, Tokyo 140-8710 , Japan
| | - Shohei Oishi
- Daiichi Sankyo Co., Ltd., 1-2-58, Hiromachi , Sinagawa-ku, Tokyo 140-8710 , Japan
| | - Takeshi Shiiki
- Daiichi Sankyo Co., Ltd., 1-2-58, Hiromachi , Sinagawa-ku, Tokyo 140-8710 , Japan
| | - Masako Soma
- Daiichi Sankyo Co., Ltd., 1-2-58, Hiromachi , Sinagawa-ku, Tokyo 140-8710 , Japan
| | - Kensuke Nakamura
- Daiichi Sankyo Co., Ltd., 1-2-58, Hiromachi , Sinagawa-ku, Tokyo 140-8710 , Japan
| | - Makoto Yoshida
- Daiichi Sankyo Co., Ltd., 1-2-58, Hiromachi , Sinagawa-ku, Tokyo 140-8710 , Japan
| | - Hiroyuki Chaya
- Daiichi Sankyo Co., Ltd., 1-2-58, Hiromachi , Sinagawa-ku, Tokyo 140-8710 , Japan
| | - Yutaka Mori
- Daiichi Sankyo Co., Ltd., 1-2-58, Hiromachi , Sinagawa-ku, Tokyo 140-8710 , Japan
| | - Ryuki Miyauchi
- Daiichi Sankyo Co., Ltd., 1-2-58, Hiromachi , Sinagawa-ku, Tokyo 140-8710 , Japan
| | - Jun Hasegawa
- Daiichi Sankyo Co., Ltd., 1-2-58, Hiromachi , Sinagawa-ku, Tokyo 140-8710 , Japan
| | - Takahiro Nagayama
- Daiichi Sankyo Co., Ltd., 1-2-58, Hiromachi , Sinagawa-ku, Tokyo 140-8710 , Japan
| | - Takeshi Honda
- Daiichi Sankyo Co., Ltd., 1-2-58, Hiromachi , Sinagawa-ku, Tokyo 140-8710 , Japan
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2
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Hirotsu T, Higashi T, Abu Hashim II, Misumi S, Wada K, Motoyama K, Arima H. Self-Assembly PEGylation Retaining Activity (SPRA) Technology via a Host-Guest Interaction Surpassing Conventional PEGylation Methods of Proteins. Mol Pharm 2017; 14:368-376. [PMID: 28032772 DOI: 10.1021/acs.molpharmaceut.6b00678] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Polyethylene glycol (PEG) modification (PEGylation) is one of the best approaches to improve the stabilities and blood half-lives of protein drugs; however, PEGylation dramatically reduces the bioactivities of protein drugs. Here, we present "self-assembly PEGylation retaining activity" (SPRA) technology via a host-guest interaction between PEGylated β-cyclodextrin (PEG-β-CyD) and adamantane-appended (Ad) proteins. PEG-β-CyD formed stable complexes with Ad-insulin and Ad-lysozyme to yield SPRA-insulin and SPRA-lysozyme, respectively. Both SPRA-proteins showed high stability against heat and trypsin digest, comparable with that of covalently PEGylated protein equivalents. Importantly, the SPRA-lysozyme possessed ca. 100% lytic activity, whereas the activity of the covalently PEGylated lysozyme was ca. 23%. Additionally, SPRA-insulin provided a prolonged and peakless blood glucose profile when compared with insulin glargine. It also showed no loss of activity. In contrast, the covalently PEGylated insulin showed a negligible hypoglycemic effect. These findings indicate that SPRA technology has potential as a generic method, surpassing conventional PEGylation methods for proteins.
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Affiliation(s)
- Tatsunori Hirotsu
- Graduate School of Pharmaceutical Sciences, Kumamoto University , 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan.,Program for Leading Graduate Schools "HIGO (Health life science: Interdisciplinary and Glocal Oriented) Program", Kumamoto University , 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan
| | - Taishi Higashi
- Graduate School of Pharmaceutical Sciences, Kumamoto University , 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan
| | - Irhan Ibrahim Abu Hashim
- Graduate School of Pharmaceutical Sciences, Kumamoto University , 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan.,Faculty of Pharmacy, Mansoura University , Mansoura 35516, Egypt
| | - Shogo Misumi
- Graduate School of Pharmaceutical Sciences, Kumamoto University , 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan
| | - Koki Wada
- Nihon Shokuhin Kako Co., Ltd. , 30 Tajima, Fuji, Shizuoka 417-8539, Japan
| | - Keiichi Motoyama
- Graduate School of Pharmaceutical Sciences, Kumamoto University , 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan
| | - Hidetoshi Arima
- Graduate School of Pharmaceutical Sciences, Kumamoto University , 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan.,Program for Leading Graduate Schools "HIGO (Health life science: Interdisciplinary and Glocal Oriented) Program", Kumamoto University , 5-1 Oe-honmachi, Chuo-ku, Kumamoto 862-0973, Japan
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3
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Gong Y, Leroux JC, Gauthier MA. Releasable Conjugation of Polymers to Proteins. Bioconjug Chem 2015; 26:1172-81. [DOI: 10.1021/bc500611k] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Yuhui Gong
- Swiss
Federal Institute of Technology Zurich (ETHZ), Department of Chemistry
and Applied Biosciences, Institute of Pharmaceutical Sciences, Vladimir-Prelog-Weg
1−5/10, 8093 Zurich, Switzerland
| | - Jean-Christophe Leroux
- Swiss
Federal Institute of Technology Zurich (ETHZ), Department of Chemistry
and Applied Biosciences, Institute of Pharmaceutical Sciences, Vladimir-Prelog-Weg
1−5/10, 8093 Zurich, Switzerland
| | - Marc A. Gauthier
- Institut National de la Recherche Scientifique (INRS), EMT Research Centre, 1650 boul. Lionel-Boulet, Varennes, J3X 1S2, Canada
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4
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Schlueter N, de Sterke A, Willmes DM, Spranger J, Jordan J, Birkenfeld AL. Metabolic actions of natriuretic peptides and therapeutic potential in the metabolic syndrome. Pharmacol Ther 2014; 144:12-27. [PMID: 24780848 DOI: 10.1016/j.pharmthera.2014.04.007] [Citation(s) in RCA: 103] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2014] [Accepted: 04/14/2014] [Indexed: 12/26/2022]
Abstract
Natriuretic peptides (NPs) are a group of peptide-hormones mainly secreted from the heart, signaling via c-GMP coupled receptors. NP are well known for their renal and cardiovascular actions, reducing arterial blood pressure as well as sodium reabsorption. Novel physiological functions have been discovered in recent years, including activation of lipolysis, lipid oxidation, and mitochondrial respiration. Together, these responses promote white adipose tissue browning, increase muscular oxidative capacity, particularly during physical exercise, and protect against diet-induced obesity and insulin resistance. Exaggerated NP release is a common finding in congestive heart failure. In contrast, NP deficiency is observed in obesity and in type-2 diabetes, pointing to an involvement of NP in the pathophysiology of metabolic disease. Based upon these findings, the NP system holds the potential to be amenable to therapeutical intervention against pandemic diseases such as obesity, insulin resistance, and arterial hypertension. Various therapeutic approaches are currently under development. This paper reviews the current knowledge on the metabolic effects of the NP system and discusses potential therapeutic applications.
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Affiliation(s)
- Nina Schlueter
- Department of Endocrinology, Diabetes and Nutrition, Center for Cardiovascular Research, Charité, University School of Medicine, Berlin, Germany
| | - Anita de Sterke
- Department of Endocrinology, Diabetes and Nutrition, Center for Cardiovascular Research, Charité, University School of Medicine, Berlin, Germany
| | - Diana M Willmes
- Department of Endocrinology, Diabetes and Nutrition, Center for Cardiovascular Research, Charité, University School of Medicine, Berlin, Germany
| | - Joachim Spranger
- Department of Endocrinology, Diabetes and Nutrition, Center for Cardiovascular Research, Charité, University School of Medicine, Berlin, Germany
| | - Jens Jordan
- Institute of Clinical Pharmacology, Hannover Medical School, Hannover, Germany
| | - Andreas L Birkenfeld
- Department of Endocrinology, Diabetes and Nutrition, Center for Cardiovascular Research, Charité, University School of Medicine, Berlin, Germany.
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5
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Bonache MA, Alaimo A, Malo C, Millet O, Villarroel A, González-Muñiz R. Clicked bis-PEG-peptide conjugates for studying calmodulin-Kv7.2 channel binding. Org Biomol Chem 2014; 12:8877-87. [DOI: 10.1039/c4ob01338g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Small bis-conjugates helix A329–350-PEG-triazole-PEG-helix B508–526 (41 residues), prepared through click chemistry of PEGylated peptide derivatives, bind to CaM with nanomolar affinity, behaving as mimics of the Kv7.2 native fragment (239 residues).
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Affiliation(s)
| | - Alessandro Alaimo
- Unidad de Biofísica
- CSIC-UPV/EHU
- Universidad de País Vasco
- 48940 Leioa, Spain
| | - Covadonga Malo
- Unidad de Biofísica
- CSIC-UPV/EHU
- Universidad de País Vasco
- 48940 Leioa, Spain
| | - Oscar Millet
- Structural Biology Unit
- CICbioGUNE
- 48160 Derio, Spain
| | - Alvaro Villarroel
- Unidad de Biofísica
- CSIC-UPV/EHU
- Universidad de País Vasco
- 48940 Leioa, Spain
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6
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Fan J, Fang G, Zeng F, Wang X, Wu S. Water-dispersible fullerene aggregates as a targeted anticancer prodrug with both chemo- and photodynamic therapeutic actions. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2013; 9:613-621. [PMID: 23117954 DOI: 10.1002/smll.201201456] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2012] [Revised: 07/18/2012] [Indexed: 06/01/2023]
Abstract
Prodrug therapy is one strategy to deliver anticancer drugs in a less reactive manner to reduce nonspecific cytotoxicity. A new multifunctional anticancer prodrug system based on water-dispersible fullerene (C60) aggregates is introduced; this prodrug system demonstrates active targeting, pH-responsive chemotherapy, and photodynamic therapeutic (PDT) properties. Incorporating (via a cleavable bond) an anticancer drug, which is doxorubicin (DOX) in this study, and a targeting ligand (folic acid) onto fullerene while maintaining an overall size of approximately 135 nm produces a more specific anticancer prodrug. This prodrug can enter folate receptor (FR)-positive cancer cells and kill the cells via intracellular release of the active drug form. Moreover, the fullerene aggregate carrier exhibits PDT action; the cytotoxicity of the system towards FR-positive cancer cells is increased in response to light irradiation. As the DOX drug molecules are conjugated onto fullerene, the DOX fluorescence is significantly quenched by the strong electron-accepting capability of fullerene. The fluorescence restores upon release from fullerene, so this fluorescence quenching-restoring feature can be used to track intracellular DOX release. The combined effect of chemotherapy and PDT increases the therapeutic efficacy of the DOX-fullerene aggregate prodrug. This study provides useful insights into designing and improving the applicability of fullerene for other targeted cancer prodrug systems.
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Affiliation(s)
- Jianquan Fan
- College of Materials Science & Engineering, State Key Laboratory of Luminescent, Materials and Devices, South China University of Technology, Guangzhou 510640, PR China
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7
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Nesher M, Bai Y, Li D, Rosen H, Lichtstein D, Liu L. Interaction of atrial natriuretic peptide and ouabain in the myocardium. Can J Physiol Pharmacol 2012; 90:1386-93. [DOI: 10.1139/y2012-112] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Natriuretic peptides and digitalis-like compounds serve as regulators of homeostasis, including control of volume expansion and blood pressure. The aim of the present study was to explore possible interactions between atrial natriuretic peptide (ANP) and ouabain in the heart. ANP (1 nmol/L) had no effect in papillary muscle preparations from guinea pigs. Ouabain (1 µmol/L) induced positive inotropic effect. The addition of ANP prior to ouabain resulted in a significant decrease in the ouabain-induced positive inotropic effect, manifested as an attenuated increase in twitch maximal upward force slope and resting muscular tension. In addition, ANP caused an increase in Na+–K+-ATPase activity in heart microsomal preparations. The effect of ouabain on Na+–K+-ATPase activity was shown in a biphasic manner. Ouabain (0.01–1 nmol/L) had a small but significant increase on pump activity, but higher doses of ouabain inhibited activity. ANP attenuated ouabain-induced Na+–K+-ATPase activity. Furthermore, ouabain (50 nmol/L) or ANP (10 nmol/L) alone induced Akt activation in cardiomyocytes. However, ANP blocked ouabain-induced Akt activation. These results point to the existence of interactions between ANP and ouabain on Na+–K+-ATPase signaling and function in the heart, which may be mediated by regulation of Na+–K+-ATPase activity and (or) signal transduction mechanisms.
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Affiliation(s)
- Maoz Nesher
- Department of Medical Neurobiology, Institute for Medical Research Israel-Canada, The Hebrew University-Hadassah Medical School, Jerusalem, Israel
| | - Yan Bai
- Department of Biochemistry and Cancer Biology, College of Medicine, University of Toledo, 3000 Arlington Ave, Toledo, MS 1020, OH 43614, USA
| | - Daxiang Li
- Department of Biochemistry and Cancer Biology, College of Medicine, University of Toledo, 3000 Arlington Ave, Toledo, MS 1020, OH 43614, USA
| | - Haim Rosen
- Department of Microbiology and Molecular Genetics, Institute for Medical Research Israel-Canada, The Hebrew University-Hadassah Medical School, Jerusalem, Israel
| | - David Lichtstein
- Department of Medical Neurobiology, Institute for Medical Research Israel-Canada, The Hebrew University-Hadassah Medical School, Jerusalem, Israel
| | - Lijun Liu
- Department of Biochemistry and Cancer Biology, College of Medicine, University of Toledo, 3000 Arlington Ave, Toledo, MS 1020, OH 43614, USA
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8
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Establishing the principle of reversibility in peptide/protein and small-molecule therapy. Ther Deliv 2012; 3:17-23. [PMID: 22833930 DOI: 10.4155/tde.11.133] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Several important pharmacological features can be integrated into injected drugs to enhance their therapeutic efficacy following administration. Short-lived peptide/protein drugs should be converted into long-lived species in vivo to avoid multiple injections. Circulating levels of anticancer agents need to be maintained within a narrow therapeutic range for prolonged period. Water-insoluble drugs must be turned into soluble species and blood-brain barrier-impermeable agents need to be modified to cross it following peripheral administrations. The derivatization requiring for achieving those desirable pharmacological features typically result in biologically/pharmacologically inactive products, unless those derivatizations can be carried out in a reversible fashion.
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9
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Vink S, Jin A, Poth K, Head G, Alewood P. Natriuretic peptide drug leads from snake venom. Toxicon 2012; 59:434-45. [DOI: 10.1016/j.toxicon.2010.12.001] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2010] [Accepted: 12/01/2010] [Indexed: 10/18/2022]
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10
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Zhao HL, Xue C, Du JL, Ren M, Xia S, Liu ZM. Balancing the Pharmacokinetics and Pharmacodynamics of Interferon-α2b and Human Serum Albumin Fusion Protein by Proteolytic or Reductive Cleavage Increases Its in Vivo Therapeutic Efficacy. Mol Pharm 2012; 9:664-70. [DOI: 10.1021/mp200347q] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hong Liang Zhao
- Department
of Microorganism Engineering, Beijing Institute of Biotechnology, 20 Dongdajie Street,
Fengtai District, Beijing 100071, People’s Republic of China
| | - Chong Xue
- Department
of Microorganism Engineering, Beijing Institute of Biotechnology, 20 Dongdajie Street,
Fengtai District, Beijing 100071, People’s Republic of China
| | - Ji Liang Du
- Department
of Microorganism Engineering, Beijing Institute of Biotechnology, 20 Dongdajie Street,
Fengtai District, Beijing 100071, People’s Republic of China
| | - Min Ren
- Department
of Microorganism Engineering, Beijing Institute of Biotechnology, 20 Dongdajie Street,
Fengtai District, Beijing 100071, People’s Republic of China
| | - Shan Xia
- Department
of Microorganism Engineering, Beijing Institute of Biotechnology, 20 Dongdajie Street,
Fengtai District, Beijing 100071, People’s Republic of China
| | - Zhi Min Liu
- Department
of Microorganism Engineering, Beijing Institute of Biotechnology, 20 Dongdajie Street,
Fengtai District, Beijing 100071, People’s Republic of China
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Fan J, Fang G, Wang X, Zeng F, Xiang Y, Wu S. Targeted anticancer prodrug with mesoporous silica nanoparticles as vehicles. NANOTECHNOLOGY 2011; 22:455102. [PMID: 22019849 DOI: 10.1088/0957-4484/22/45/455102] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A targeted anticancer prodrug system was fabricated with 180 nm mesoporous silica nanoparticles (MSNs) as carriers. The anticancer drug doxorubicin (DOX) was conjugated to the particles through an acid-sensitive carboxylic hydrazone linker which is cleavable under acidic conditions. Moreover, folic acid (FA) was covalently conjugated to the particle surface as the targeting ligand for folate receptors (FRs) overexpressed in some cancer cells. The in vitro release profiles of DOX from the MSN-based prodrug systems showed a strong dependence on the environmental pH values. The fluorescent dye FITC was incorporated in the MSNs so as to trace the cellular uptake on a fluorescence microscope. Cellular uptakes by HeLa, A549 and L929 cell lines were tested for FA-conjugated MSNs and plain MSNs respectively, and a much more efficient uptake by FR-positive cancer cells (HeLa) can be achieved by conjugation of folic acid onto the particles because of the folate-receptor-mediated endocytosis. The cytotoxicities for the FA-conjugated MSN prodrug, the plain MSN prodrug and free DOX against three cell lines were determined, and the result indicates that the FA-conjugated MSN prodrug exhibits higher cytotoxicity to FR-positive cells, and reduced cytotoxicity to FR-negative cells. Thus, with 180 nm MSNs as the carriers for the prodrug system, good drug loading, selective targeting and sustained release of drug molecules within targeted cancer cells can be realized. This study may provide useful insights for designing and improving the applicability of MSNs in targeted anticancer prodrug systems.
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Affiliation(s)
- Jianquan Fan
- College of Materials Science & Engineering, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, People's Republic of China
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12
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Sasson K, Marcus Y, Lev-Goldman V, Rubinraut S, Fridkin M, Shechter Y. Engineering prolonged-acting prodrugs employing an albumin-binding probe that undergoes slow hydrolysis at physiological conditions. J Control Release 2010; 142:214-20. [DOI: 10.1016/j.jconrel.2009.10.028] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2009] [Revised: 10/21/2009] [Accepted: 10/26/2009] [Indexed: 11/30/2022]
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13
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Nesher M, Dvela M, Igbokwe VU, Rosen H, Lichtstein D. Physiological roles of endogenous ouabain in normal rats. Am J Physiol Heart Circ Physiol 2009; 297:H2026-34. [PMID: 19837951 DOI: 10.1152/ajpheart.00734.2009] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Endogenous ouabain (EO)-like compounds are synthesized in and released from the adrenal gland. Although EO has been implicated in several pathological states such as hypertension and heart and kidney failure, its physiological roles in normal animal have not been elucidated. To address this issue, we studied the effects of reduction in plasma EO resulting from antiouabain antibody administration. Normal rats were treated for 28 days with antiouabain antibodies or rabbit IgG as control. Infusions were delivered through a jugular vein cannula by osmotic pumps, and blood pressure was monitored by tail-cuff plethysmography. The animals were housed in metabolic cages to measure water and food consumption and urine excretion. After 28 days, the thoracic aorta was isolated and used to study phenylephrine-induced contraction and atrial natriuretic peptide (ANP)-induced vasorelaxation. The adrenal gland cortex was enlarged in the antiouabain antibody-treated rats. Moreover, on the second day of treatment, there was a significant transient reduction in natriuresis in the antiouabain antibody-treated rats, suggesting that EO is a natriuretic hormone. Reduction in natriuresis was also observed when EO levels were reduced by active immunization resulting from sequential injection of ouabain-albumin. Furthermore, following 28 days of treatment, the response to phenylephrine was significantly lowered and that to ANP was significantly increased in aortic rings from antiouabain antibody-treated rats. These findings show for the first time that circulatory ouabain plausibly originating in the adrenal has physiological roles controlling vasculature tone and sodium homeostasis in normal rats.
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Affiliation(s)
- Maoz Nesher
- Department of Medical Neurobiology, Institute for Medical Research Israel-Canada, The Hebrew University-Hadassah Medical School, Jerusalem, Israel 91120, P.O.B 12272
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Marcus Y, Sasson K, Fridkin M, Shechter Y. Turning Low-Molecular-Weight Drugs into Prolonged Acting Prodrugs by Reversible Pegylation: A Study with Gentamicin. J Med Chem 2008; 51:4300-5. [DOI: 10.1021/jm8002558] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yonit Marcus
- Departments of Biological Chemistry and Organic Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Keren Sasson
- Departments of Biological Chemistry and Organic Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Mati Fridkin
- Departments of Biological Chemistry and Organic Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Yoram Shechter
- Departments of Biological Chemistry and Organic Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel
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